ONKYO Integra M-508

Commentary

A stereo power amplifier that pursues a real-phase (digital) amplifier configuration that reproduces accurate phase and sound fields.

In order to prevent the input signal from being out of phase, it is necessary to prevent the out-of-phase speaker current from returning to the amplifier section. Therefore, a power in-phase transformer is added to the current path to eliminate interference with the amplifier circuit.
The Integra M-508 uses an independent power supply system on the left and right sides. The phase characteristic of the amplifier is improved by installing two power in-phase transformers for L and R only.
The power in-phase transformer also eliminates common-mode noise from the AC line.

High power is achieved by a 4-transformer power supply consisting of a power in-phase transformer for L/R, a triple push-pull power transistor, an 8 x large 10,000 μ F capacitor power supply, and direct power supply for the shortest distance.

In order to suppress low-level degradation that is a problem in high-power amplifiers, we have achieved a low distortion rate by adopting a linear switching method, low-noise bias setting using LED, and W sensing servo circuit configuration.

Two input terminals, Direct and Variable, are installed.

Equipped with a peak meter that can switch the meter range to 2 stages.
This meter can be turned on / off.

Uses a power cord with polarity display.

Uses left and right independent level controller with high-precision multi-brush.

Model Rating

Type	Stereo power amplifier
Amplifier Unit
Rated Output (20 Hz ~ 20 kHz)	290W + 290W (4 Ω) 240W + 240W (6 Ω) 200W + 200W (8 Ω)
Dynamic Power	690W + 690W (2 Ω) 460W + 460W (4 Ω) 270W + 270W (8 Ω)
Total harmonic distortion factor	0.002% (20 Hz ~ 20 kHz, 8 Ω, at Rated Output)
Cross modulation distortion factor	0.003% (70 Hz : 7 kHz = 4 : 1, at rated output)
Powerbandwidth	5 Hz to 100 kHz (IHF-3dB, THD0.2%)
Gain	32dB
Frequency characteristic	1 Hz ~ 100 kHz + 0 -1.5 dB
Input Sensitivity / Impedance	1V/20k Ω
Signal-to-noise ratio	124 dB (IHF-A filter, input short)
Damping factor	140 (8 Ω, 50 Hz)
Input terminal	Variable : 1 system Direct : 1 route
Output terminal	Speakers : 2 routes
Meter Section
Range switching	x1(0dB=200W) x0.1(0dB=20W)
Indication range	x1 Range : 0.01W ~ 500W x0.1 range : 0.001W ~ 50W
Indication accuracy	0 ± 1 dB -10 + / - 2 dB -20 + / - 3 dB
Response speed	100 μ sec (∞ → 0 dB)
Return speed	1 sec (0 dB → -20dB)
<General>
AC outlet	Power switch not linked : 1 system, 100W
Pwer	100 VAC, 50Hz/60Hz
Power consumption	500W (Electrical Appliance and Material Control Law)
External dimensions	Width 465x Height 187x Depth 426 mm
Weight	25kg